CN104825186A - Radiator diaphragm, related computer tomography device, and control method thereof - Google Patents
Radiator diaphragm, related computer tomography device, and control method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002591 computed tomography Methods 0.000 title abstract 3
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 238000002083 X-ray spectrum Methods 0.000 claims description 29
- 230000009977 dual effect Effects 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 17
- 238000007689 inspection Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 5
- 230000004069 differentiation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013170 computed tomography imaging Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 235000014698 Brassica juncea var multisecta Nutrition 0.000 description 1
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 208000036626 Mental retardation Diseases 0.000 description 1
- 241000251184 Rajiformes Species 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010223 real-time analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/06—Diaphragms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/48—Diagnostic techniques
- A61B6/482—Diagnostic techniques involving multiple energy imaging
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/02—Constructional details
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/10—Scattering devices; Absorbing devices; Ionising radiation filters
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- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Optics & Photonics (AREA)
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- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention relates to a radiator diaphragm for generating a fan beam, which comprises at least two slot openings connected to a rear part of an X-ray source, the at least two slit openings are provided with same opening size and can move relative to the X-ray radiation source, wherein, an X-ray filter is arranged in the region of one of the slot opening. The present invention also relates to a computer tomography device and a method for controlling the computer tomography device.
Description
Technical field
The present invention relates to a kind of irradiator diaphragm being suitable for the fan ray producing X-radiation.The invention still further relates to a kind of computed tomographic apparatus with this irradiator diaphragm and a kind of method for controlling this computed tomographic apparatus.
Background technology
In clinical practice, be used for the data set of radioscopic image by means of computed tomographic apparatus record, determine the specific material in the object of examine or patient accordingly.The aspect that material is determined has more and more important in routine clinical problem, and the meaning of computed tomographic apparatus and range of application are obviously increased.
By means of Object Classification computed tomographic apparatus analyze and diagram X-ray data time according to the ratio juris effect of so-called dual energy side.In this method, the object of examine or patient are such as with the X-ray quantum up to 80keV and scan with the X-ray quantum up to 140keV.Create different average attenuation by the different X-ray spectrum of two X-radiations, make in normal operation, to obtain more substantial information compared with the computed tomographic apparatus of routine.
At this, two can be used with the x-ray radiator of different energy in scan period, or the tube voltage of x-ray radiator alternately can switch between two of an x-ray radiator scanning directly one after the other performed or position.The different tube voltage of two scannings causes the change for the X-ray spectrum required by dual energy method.
This change of X-ray spectrum is also amplified by x-ray filter, and described x-ray filter is arranged in ray optical path in one of two scannings or position.Other replacement scheme is by purpose using x-ray filter to decay at least in part the X-radiation of given energy of x-ray source in the ray optical path of x-ray source, to produce the X-radiation of variable energy.This replacement scheme also requires the hardware expanding of computed tomography imaging system except software extensions, and motion and location wherein for carrying out x-ray filter need method mechanism separately.Such as, US 2008/0198963 A1 and US2005/0220265 A1 is open a kind of for the visual x-ray system of dual energy, and wherein rotatable x-ray filter can be positioned in X-ray, and X-ray spectrum is changed by the rotation of x-ray filter.Alternately take at this for each position, wherein each shooting corresponds to other X-ray spectrum.
Summary of the invention
Technical problem to be solved by this invention provides a kind of other solution for performing dual energy method.
This technical problem for define and the irradiator diaphragm of X-ray fan ray that molding is sent by x-ray radiation source solves by a kind of, also solved by a kind of computed tomographic apparatus with this irradiator diaphragm and is solved by a kind of method controlling this computed tomographic apparatus.Wherein irradiator diaphragm has at least two gap openings movably measure-alike relative to x-ray radiation source for defining fan ray, wherein in the region of one of gap opening, is provided with x-ray filter.
The present invention is based on following consideration, namely by means of the x-ray filter of X-radiation that can weaken unique x-ray source, the X-ray spectrum of described X-radiation is changed relative to not filtered X-radiation.With this, can produce or amplifying X-ray spectrum change.The present invention is in addition based on following consideration, namely movably arrange that the irradiator diaphragm of x-ray filter is within it saved material ground and performs this change of X-ray spectrum simply with (regularly) by means of relative to x-ray source, it is characterized in that dog-cheap realization.
Two are preferably arranged in common aperture plate relative to the moveable gap opening of x-ray radiation source at this, described aperture plate provides gap opening to form each layer thickness of the scanning of pending hope, and namely irradiator diaphragm can comprise this type of aperture plate and especially be made up of this class aperture plate.Aperture plate preferably has the shape of substantially flat tabular, but also can conceive other shape, especially with the shape in bending face.Aperture plate is movably disposed within the ray optical path of x-ray source.Located with corresponding by the immigration of irradiator diaphragm or aperture plate, x-ray filter and the gap opening without wave filter on purpose move into and shift out ray optical path.Therefore, computed tomography imaging system can run in mode standard and dual-energy mode.Irradiator diaphragm or its parts, such as aperture plate, comprise at least two gap openings, described gap opening is provided for molding fan ray and can changes simply, therefore also existing standard computer fault imaging device can be adapted as and take for dual energy.Gap opening comprises the parts (such as aperture plate) of gap opening motion by irradiator diaphragm or it can be located.Preferably, provide multiple gap opening with different sizes and/or different x-ray filter, the motion that described gap opening comprises the parts of gap opening by the motion of irradiator diaphragm or irradiator diaphragm can be located in fan ray.Different x-ray filter is chosen as different requirements or applicable cases in its material and/or its thickness.
Preferably, fully gap opening is covered in the x-ray filter of this irradiator diaphragm.With this, x-ray filter covers the region of the whole hope of X-ray detector on two bearing of trend limited when time in the ray optical path being arranged in x-ray source.Bearing of trend is the φ direction of X-ray detector at this, i.e. the Z-direction of the longitudinal direction of X-ray detector, and X-ray detector, the i.e. horizontal direction of X-ray detector.The region of wishing is limited by the size of selected gap opening and is known.
Especially preferably, x-ray filter is fixedly placed on irradiator diaphragm.Preferred especially, x-ray filter faces x-ray source and arranges.
X-radiation this be interpreted as formed due to the tube voltage applied in x-ray radiator between the anode and cathode and the radiation of launching with fan ray form from x-ray radiator.The maximum in units of keV of the spectrum of this X-radiation corresponds to the maximum in units of kV of tube voltage.By using x-ray filter to create on two times fan ray in succession, i.e. the fan ray of unfiltered and filtering, described fan ray has different X-ray spectrums and one after the other penetrates patient and then detected by X-ray detector.The generation of filtered fan ray is formed by the location of irradiator diaphragm, makes it fully cover fan ray in the ray optical path making x-ray filter be arranged in radiation source.Unfiltered fan ray is the original X-radiation determined by tube voltage at this.The change of X-ray spectrum of the fan ray filtered is depended on and is especially depended on the thickness that will be penetrated by X-radiation of used material and filter material by the structure of x-ray filter.
Because the position of the gap opening of irradiator diaphragm and therefore the position of x-ray filter in ray optical path be known in time, so two fan raies that the data of being taken by X-ray detector can be composed with different x-ray associate.Obtain two data sets with specific information content by this dependency, especially determine the tissue be transmitted or the material of inspection area by means of described data set.Accurately analyzing in the data obtained by X-ray detector especially, preferably the position of irradiator diaphragm of x-ray radiator being associated with the position of X-ray detector, making to there is the dependency providing data and should associate with which fan ray when analyzing.The dependency of the captured data of X-ray detector is known by the relatedness of the position with x-ray filter for any moment, and considers to be used for real-time analysis.
The solution of advising of taking for obtaining dual energy is favourable especially, because do not require two parts of computed tomographic apparatus, such as two with the voltage-operated x-ray source of different X-ray and two X-ray detectors.In addition, irradiator diaphragm according to the present invention can be used for reequiping conventional computed tomographic apparatus, mode only changes irradiator diaphragm and in dual energy method, correspondingly uses irradiator diaphragm for strengthening the differentiation of X-ray spectrum, and the tube voltage of wherein unique x-ray radiation source alternately switches between two scannings directly one after the other performed or location of x-ray radiator.Alternatively, irradiator diaphragm according to the present invention can be used for reequiping conventional computed tomographic apparatus, mode is only replaced irradiator diaphragm and in dual energy method, uses irradiator diaphragm correspondingly for generation of the differentiation of X-ray spectrum, and wherein unique x-ray radiation source runs with constant tube voltage.That advised improves single source computer fault imaging device for the solution obtaining dual energy shooting with dual energy shooting probability, or makes single source computer fault imaging device for dual energy scanner in technical simple mode.Realize on wider basis, in routine clinical, to set up dual energy shooting with this.
According to preferably implementing variant, the x-ray filter for the radiation of filtering low energy X ray is formed by zinc, aluminum, copper, titanium or tungsten according to selection.Low energy X ray radiation is especially interpreted as until the X-ray spectrum of maximum intensity of the not filtered bremsstrahlung radiation launched at this.Carry out the sclerosis of so-called X-radiation at this, namely X-radiation is weakened generally, and wherein this weakening is worked and therefore causes the greater share of the X-radiation of more high energy to be distributed in X-ray spectrum in mental retardation share with strengthening.Alternatively or additionally, the feature of the hope of x-ray filter regulates by the thickness of the filter material selected matchingly.In addition, x-ray filter also can be wave filter that is double-deck or multilamellar, namely described x-ray filter is had the different layers formed formed by two or more, and described layer, by stacked in radiation direction and define filter cell, makes described layer by one after the other transmission.Depend on the structure (material, thickness etc.) of x-ray filter, cause the change of X-ray spectrum.
Advantageously, irradiator diaphragm comprise at least one pair of with and without for the formation of fan ray the gap opening of wave filter.Advantageously, irradiator diaphragm comprise multipair with and without the gap opening of the wave filter for the formation of fan ray.So-called to this by with given size first gap opening without x-ray filter and have x-ray filter and and the second measure-alike gap opening of the first gap opening form.Advantageously, the gap opening that measure-alike but type is different, namely without the gap opening of wave filter be arranged in the different region of two of irradiator diaphragm with the gap opening of wave filter.Such as, irradiator diaphragm has the first and second regions, and described region is arranged overlappingly on the direction of the longitudinal direction perpendicular to irradiator diaphragm.Such as, at least all gap openings without x-ray filter are arranged in the gap openings with x-ray filter in first area and at least all and are arranged in second area.In special form of implementation, what x-ray filter covered irradiator diaphragm is provided with at least all regions with the gap opening of x-ray filter.This simplify the manufacture of irradiator diaphragm.Preferably, this measure-alike with and without wave filter two gap openings between distance be identical for often pair of gap opening.Alternatively, arranging symmetrically relative to the border between two regions of different regions.Border between two different regions is such as the centrage in a longitudinal direction of irradiator diaphragm or aperture plate.
In the favourable structure substituted, dissimilar gap opening, namely at least one gap opening without wave filter and at least one gap opening with x-ray filter are arranged side by side.Advantageously, all dissimilar gap openings are arranged in this way.Preferably, this two same sizes with and without wave filter gap opening between distance be identical for often pair of gap opening altogether.
In the other favourable expansion of irradiator diaphragm according to the present invention, irradiator diaphragm has at least one other gap opening without wave filter to define fan ray at this.There is provided gap opening for each layer thickness of the pending expectation scanning of shaped radiation device diaphragm with this, this only provides for the normal mode of computed tomographic apparatus or dual-energy mode and does not improve X-ray differentiation by additional x-ray filter.This achieve the structure of the simple cheapness of irradiator diaphragm, wherein the execution of dual energy method at least can realize for certain layer thickness of pending expectation scanning.
This technical problem is also solved by computed tomographic apparatus according to the present invention, and described computed tomographic apparatus comprises the X-ray detector being with the rotatable x-ray radiator of the with good grounds irradiator diaphragm for generation of fan ray of the present invention and diametrically opposed the analytic unit arranged with correspondence of locating.At this, at least two gap openings of irradiator diaphragm are movable at computed tomographic apparatus run duration, make alternately to can be positioned in the ray optical path of the x-ray source of x-ray radiator with the gap opening of wave filter, and can be positioned in the ray optical path of the x-ray source of x-ray radiator without the gap opening of wave filter, make inspection area one after the other by different X-ray spectrums fan ray irradiate through.At this, irradiator diaphragm on the whole or the members movable comprising gap opening of irradiator diaphragm.With this, the X-ray spectrum of incident X-radiation especially the time alternately changes in time.With this, also produce or improve the differentiation from the X-ray spectrum of the X-radiation of incidence.In addition, analytic unit is formed as the measuring-signal of the measuring-signal of not filtered radiation and filtered radiation to analyze dividually to take for obtaining dual energy.
The advantage set forth relative to irradiator diaphragm and preferred structure are reasonably converted to computed tomographic apparatus and control method thereof.
Preferably, computed tomographic apparatus can run without x-ray filter and with or without x-ray filter can be run in dual-energy mode in normal operation.Especially, computed tomographic apparatus can run with order scanning or helical scanning in dual-energy mode.
In the other preferred expansion of computed tomographic apparatus according to the present invention, the gap opening of irradiator diaphragm is arranged movingly and is such as arranged movably, make x-ray radiator completely rotate during at least the gap opening with wave filter be positioned at the primary importance in the ray optical path of the x-ray source of x-ray radiator and be positioned at without the gap opening of wave filter x-ray radiator x-ray source ray optical path in the second position between scalable.Achieve the execution of dual energy image pickup method or the execution of improvement with this, wherein inspection area is irradiated with the fan ray with the first X-ray spectrum and is irradiated with second fan ray with the second X-ray spectrum during the Part II of the rotation of x-ray radiator during a part for the rotation of x-ray radiator.
In the other favourable expansion of computed tomographic apparatus according to the present invention, the gap opening of irradiator diaphragm is arranged movingly, make described gap opening arbitrary scan period when x-ray radiator is in each position at least the gap opening with wave filter be positioned at the primary importance in the ray optical path of the x-ray source of x-ray radiator and be positioned at without the gap opening of wave filter x-ray radiator x-ray source ray optical path in the second position between scalable.Achieve the execution of dual energy image pickup method or the execution of improvement with this, wherein first inspection area is irradiated with the fan ray with the first X-ray spectrum and is then irradiated with the fan ray with the second X-ray spectrum in each camera site of x-ray radiator.
This technical problem is also solved by a kind of method for computer for controlling fault imaging device according to the present invention, wherein computed tomographic apparatus comprises the X-ray detector of rotatable x-ray radiator for generation of fan ray and diametrically opposed the analytic unit arranged with correspondence of locating, wherein x-ray source alternately connects with the gap opening with the irradiator diaphragm without wave filter afterwards, and wherein alternately form filtered and not filtered fan ray by means of with the gap opening without wave filter, wherein fan ray has different X-ray spectrums, and the measuring-signal of the measuring-signal of not filtered fan ray and filtered fan ray is analyzed to obtain dual energy dividually and is taken.
In the favourable expansion substituted of method according to the present invention, during x-ray radiator rotates completely, the gap opening with the irradiator diaphragm of wave filter is connected to x-ray source afterwards at least one times and gap opening without the irradiator diaphragm of wave filter is connected to x-ray source at least one times afterwards.
In the other favourable expansion of method according to the present invention, when arbitrary scan period is in each position in x-ray radiator, the gap opening with the irradiator diaphragm of wave filter is connected to irradiator diaphragm afterwards at least one times and gap opening without the irradiator diaphragm of wave filter is connected to irradiator diaphragm at least one times afterwards.
The execution of dual energy image pickup method or the execution of improvement is achieved with this, wherein inspection area is irradiated with first fan ray with the first X-ray spectrum and is irradiated with second fan ray with the second X-ray spectrum, obtains about by a large amount of information relevant to material of check object scanned with this.
Accompanying drawing explanation
The present invention exemplarily explains according to embodiment again in detail by reference to accompanying drawing hereinafter.At this, parts identical in different drawings provide with identical drawing reference numeral.Diagram is in the accompanying drawings schematic and obviously simplifies and do not draw in proportion forcibly.
Each figure is:
Fig. 1 is the axonometric chart according to x-ray radiator of the present invention,
Fig. 2 is the side view of the irradiator diaphragm 3 of Fig. 1,
Fig. 3 is the axonometric chart of the irradiator diaphragm for x-ray radiator according to the present invention,
Fig. 4 is the axonometric chart of the other irradiator diaphragm for x-ray radiator according to the present invention,
Fig. 5 is the axonometric chart of the other irradiator diaphragm for x-ray radiator according to the present invention, and
Fig. 6 is the axonometric chart of the other irradiator diaphragm for x-ray radiator according to the present invention.
Detailed description of the invention
Schematically illustrate according to x-ray radiator 1 of the present invention in FIG, described x-ray radiator 1 be formed as generation of fan ray and described x-ray radiator 1 comprise at least one x-ray radiation source (not shown) and after be connected to x-ray source and relative to the moveable irradiator diaphragm 3 of x-ray source, described irradiator diaphragm 3 is configured to aperture plate.Irradiator diaphragm has plate shape shape and four gap openings 4 for molding fan ray.In other form of implementation, irradiator diaphragm 3 can comprise other parts or assembly except aperture plate.In this illustrated example, in the first area 5 that each two gap openings 4 of different in width are arranged in irradiator diaphragm 3 and second area 6, wherein two regions 5,6 adjoin each other with the centrage of irradiator diaphragm on longitudinal direction 7.In this example, two gap openings 4 ' in second area 6 have the x-ray filter 8 extended on second area 6, to weaken through the radiation of this gap opening 4 ' with described x-ray filter 8, and make fan beam have the X-ray spectrum different from the X-ray spectrum of incident radiation after passage.Irradiator diaphragm 3 is removable point-blank along the longitudinal direction of horizontal direction namely perpendicular to irradiator diaphragm of irradiator diaphragm.The mobile route of irradiator diaphragm is illustrated by the dotted line with arrow.With this, certain gap opening 4 can be arranged in the ray optical path of x-ray source 2.
Schematically illustrate in side view in fig. 2 Fig. 1 according to x-ray radiator 1 of the present invention.Irradiator diaphragm 3 has first area 5 and second area 6 at this, and described first area 5 and second area 6 adjoin each other with irradiator diaphragm centrage 7 in a longitudinal direction.In first area 5, gap opening 4 " not there is x-ray filter.In second area 6, gap opening 4 ' has x-ray filter 8, and described x-ray filter 8 extends on whole second area 6.X-ray filter 8 is fixedly placed on irradiator diaphragm.X-ray filter 8 is arranged on the side facing x-ray source 2 of irradiator diaphragm 3.
The other structure of the irradiator diaphragm 3 according to x-ray radiator 1 of the present invention is schematically illustrated in figure 3 with axonometric chart.Irradiator diaphragm 3 has eight gap openings 4.At this, each two gap openings have identical size.Four openings 4 in this opening 4 " be formed as without x-ray filter 8 and be in the first area 5 of irradiator diaphragm 3.Remaining four gap openings 4 ' are in addition provided with x-ray filter 8, and described x-ray filter 8 covers the entire area of four gap openings 4 '.In not shown example, each gap opening 4 ' has independent x-ray filter 8, and this independent x-ray filter 8 covers the area of its oneself gap opening 4 '.At this, different x-ray filter 8 can take on a different character.In the example shown in the series of figures, with the gap opening 4 ' of wave filter and the gap opening 4 without wave filter " layout and measure-alike and only to move linearly a distance d relative to irradiator diaphragm centrage 7 in a longitudinal direction.With this, with and without the same size of wave filter two gap openings between distance d for each gap opening to 4 ', 4 " identical.
The other structure of the irradiator diaphragm 3 according to x-ray radiator 1 of the present invention is schematically illustrated in the diagram with axonometric chart.Irradiator diaphragm 3 has eight gap openings 4.At this, each two gap openings have identical size.Four openings 4 in this opening 4 " be formed as without x-ray filter 8 and be in the first area 5 of irradiator diaphragm 3.Remaining four gap openings 4 ' are in addition furnished with x-ray filter 8, and described x-ray filter 8 covers the entire area of four gap openings 4 '.In not shown example, each gap opening 4 ' has independent x-ray filter 8, and described x-ray filter 8 covers the area of its oneself gap opening 4 '.At this, different x-ray filter 8 can take on a different character.In the example shown in the series of figures, with the gap opening 4 ' of wave filter and the gap opening 4 without wave filter " layout and measure-alike and only formed symmetrically relative to irradiator diaphragm centrage 7 in a longitudinal direction.With this, with and without the same size of wave filter two gap openings between distance d for each gap opening to 4 ', 4 " outwards become large.
The other structure of the irradiator diaphragm 3 according to x-ray radiator 1 of the present invention is schematically illustrated in Figure 5 with axonometric chart.Irradiator diaphragm 3 has eight gap openings 4.At this, each two gap openings have identical size.Four openings 4 in this opening 4 " be formed as without x-ray filter 8, and remaining four gap openings 4 ' are in addition respectively equipped with an x-ray filter 8, described x-ray filter 8 covers the entire area of four gap openings 4 '.In addition, with the gap opening 4 ' and 4 with the same size without wave filter " be arranged side by side in couples.The in-order structure of irradiator diaphragm is achieved, wherein, the gap opening 4 without x-ray filter with this " side is provided with the gap opening 4 ' with x-ray filter of attaching troops to a unit.In the example shown in the series of figures, the distance also between two gap openings of mutually attaching troops to a unit of same size is chosen as identical.In the example shown in the series of figures, each gap opening 4 ' has independent x-ray filter 8, and described x-ray filter 8 covers the entire area of its gap opening 4 '.At this, different x-ray filter 8 can take on a different character.
The other structure of the irradiator diaphragm 3 according to x-ray radiator 1 of the present invention is schematically illustrated in figure 6 with axonometric chart.Irradiator diaphragm 3 has five gap openings 4.At this, four gap openings 4 without wave filter " be of different sizes, make can select four different thickness for scanning.In addition, irradiator diaphragm 3 has the gap opening 4 ' with wave filter, and described gap opening 4 ' has and four gap openings 4 " identical size.In the example shown in the series of figures, formed abreast with two the measure-alike gap openings without wave filter.In not shown example, be formed as being separated from each other with arbitrary distance with two gap openings with the same size without wave filter, wherein can have the gap opening 4 without wave filter of any amount betwixt ".Realize the dual energy method for fixing scanning slice thickness with this, wherein other layer thickness is provided for normal operation.This achieve generally simple of irradiator diaphragm and irradiator and the structure of cheapness, and give dual energy method or its probability improved in a straightforward manner.
Claims (15)
1. one kind for defining and the irradiator diaphragm of X-ray fan ray that sent by x-ray radiation source of molding, wherein said irradiator diaphragm has at least two gap openings for defining fan ray relative to the moveable same size of x-ray radiation source, wherein, in the region of one of described gap opening, x-ray filter is provided with.
2. irradiator diaphragm according to claim 1, wherein, described x-ray filter covers the entire area of one of described gap opening.
3. according to the irradiator diaphragm in aforementioned claim described in, wherein, at least two are arranged in aperture plate relative to the moveable gap opening of x-ray radiation source.
4. according to the irradiator diaphragm in aforementioned claim described in, wherein, described x-ray filter to be fixedly placed on irradiator diaphragm and to face x-ray source and arranges.
5. according to the irradiator diaphragm in aforementioned claim described in, wherein, described x-ray filter is formed by zinc, aluminum, copper, titanium or tungsten according to selection.
6. according to the irradiator diaphragm in aforementioned claim described in, described irradiator diaphragm comprise multipair with the gap opening without wave filter, wherein pair of slits opening has identical size and respectively wherein without the gap opening of wave filter be arranged in the different region of two of irradiator diaphragm with the gap opening of wave filter.
7. irradiator diaphragm according to claim 5, wherein, what described x-ray filter fully covered irradiator diaphragm is wherein provided with at least all regions with the gap opening of x-ray filter.
8. according to the irradiator diaphragm in aforementioned claim described in, described irradiator diaphragm comprise multipair respectively with the gap opening without wave filter, wherein the gap opening of a pair has identical size respectively and is wherein arranged side by side without with the gap opening with same size with wave filter.
9. the irradiator diaphragm according to claim 6 or 7, wherein, with and without wave filter and with identical size pair of slits opening between distance all identical for often pair.
10., according to the irradiator diaphragm in aforementioned claim described in, comprise the gap opening for defining fan ray without wave filter that at least one is other.
11. 1 kinds of computed tomographic apparatus, comprise the rotatable x-ray radiator of the irradiator diaphragm for generation of fan ray described in one in the with good grounds claim 1 to 9 of band and the X-ray detector of diametrically opposed the analytic unit with correspondence arranging of locating, at least two gap openings of wherein said irradiator diaphragm are in operation movable, the gap opening with wave filter and the gap opening without wave filter is made alternately to be positioned in the ray optical path of x-ray source of x-ray radiator, make inspection area one after the other by different X-ray spectrums fan ray irradiate through, and wherein analytic unit is formed as the measuring-signal of the measuring-signal of not filtered fan ray and filtered fan ray to analyze dividually to take for obtaining dual energy.
12. computed tomographic apparatus according to claim 11, wherein said gap opening is arranged movingly, make described gap opening arbitrary scan period at least can be positioned at the primary importance in the ray optical path of the x-ray source of x-ray radiator at the gap opening with wave filter when x-ray radiator is in each position and be positioned at without the gap opening of wave filter x-ray radiator x-ray source ray optical path in the second position between regulate.
13. 1 kinds for controlling the method for the computed tomographic apparatus according to claim 11 or 12, wherein computed tomographic apparatus comprise with after the X-ray detector of the rotatable x-ray radiator of the irradiator diaphragm for generation of fan ray that connects and diametrically opposed the analytic unit arranged with correspondence of locating, wherein
-described x-ray source is alternately connected to the gap opening of the gap opening with the irradiator diaphragm of wave filter and the irradiator diaphragm without wave filter afterwards,
-alternately form filtered and not filtered fan ray by means of with the gap opening without wave filter, wherein, described fan ray has different X-ray spectrums, and
-measuring-signal of the measuring-signal of filtered fan ray and not filtered fan ray analyzed dividually and takes for obtaining dual energy.
14. methods according to claim 13, wherein during described x-ray radiator rotates completely, the gap opening with the irradiator diaphragm of wave filter is connected to described irradiator diaphragm at least one times afterwards and gap opening without the irradiator diaphragm of wave filter is connected to described irradiator diaphragm at least one times afterwards.
15. methods according to claim 13, wherein when arbitrary scan period is in each position in described x-ray radiator, the gap opening with the irradiator diaphragm of wave filter is connected to irradiator diaphragm afterwards at least one times and gap opening without the irradiator diaphragm of wave filter is connected to described irradiator diaphragm at least one times afterwards.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014202331.9 | 2014-02-10 | ||
| DE102014202331.9A DE102014202331B3 (en) | 2014-02-10 | 2014-02-10 | Radiator screen for generating a fan beam, computed tomography device with such a radiator aperture and method for controlling such a computed tomography device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104825186A true CN104825186A (en) | 2015-08-12 |
| CN104825186B CN104825186B (en) | 2017-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510024859.0A Active CN104825186B (en) | 2014-02-10 | 2015-01-19 | Radiator diaphragm and relevant computed tomographic apparatus and its control method |
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| Country | Link |
|---|---|
| CN (1) | CN104825186B (en) |
| BR (1) | BR102015002919A2 (en) |
| DE (1) | DE102014202331B3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103829963A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | Collimation instrument and CT system with same |
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| US4821306A (en) * | 1984-06-19 | 1989-04-11 | B.V. Optische Industrie "De Oude Delft" | System for detecting two X-ray energies |
| US20040234031A1 (en) * | 2003-04-16 | 2004-11-25 | Tom Francke | Dual-energy scanning-based detection of ionizing radiation |
| CN1589744A (en) * | 2003-09-05 | 2005-03-09 | Ge医疗系统环球技术有限公司 | X-ray CT apparatus and X-ray tube |
| KR101228911B1 (en) * | 2010-08-06 | 2013-02-15 | 라드텍주식회사 | An X-ray imaging apparatus using dual-energy X-ray absorptiometry |
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| US4277685A (en) * | 1978-06-12 | 1981-07-07 | Ohio-Nuclear, Inc. | Adjustable collimator |
| US6973158B2 (en) * | 2003-06-25 | 2005-12-06 | Besson Guy M | Multi-target X-ray tube for dynamic multi-spectral limited-angle CT imaging |
| US7463715B2 (en) * | 2007-02-20 | 2008-12-09 | Siemens Medical Solutions Usa, Inc. | System and method for real time dual energy x-ray image acquisition |
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2014
- 2014-02-10 DE DE102014202331.9A patent/DE102014202331B3/en active Active
-
2015
- 2015-01-19 CN CN201510024859.0A patent/CN104825186B/en active Active
- 2015-02-10 BR BR102015002919-5A patent/BR102015002919A2/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4821306A (en) * | 1984-06-19 | 1989-04-11 | B.V. Optische Industrie "De Oude Delft" | System for detecting two X-ray energies |
| US20040234031A1 (en) * | 2003-04-16 | 2004-11-25 | Tom Francke | Dual-energy scanning-based detection of ionizing radiation |
| CN1589744A (en) * | 2003-09-05 | 2005-03-09 | Ge医疗系统环球技术有限公司 | X-ray CT apparatus and X-ray tube |
| KR101228911B1 (en) * | 2010-08-06 | 2013-02-15 | 라드텍주식회사 | An X-ray imaging apparatus using dual-energy X-ray absorptiometry |
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| CN103829963A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | Collimation instrument and CT system with same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104825186B (en) | 2017-11-03 |
| BR102015002919A2 (en) | 2018-03-13 |
| DE102014202331B3 (en) | 2015-08-06 |
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